These are - without doubt - the ultimate cable-management-clips: Stunning quality and beauty.
This size is exactly specified for sleeved fan-, pump- or similar cables. You typically mount them with screws (M3 or UNC) to empty motherboard-threads or even put them on top of the motherboard by using the screws, which already fix the board to the tray. Of course you can also make your own threads.
As usual for MDPC-selections, these cable-management-clips are without compromise: No cheap cost-saving quality. In the visible area, you won't find any writing, cut-off-areas (bumps or scratches) or similar optical compromises. You will not accidentally break these cable-management-clips. The screw hole is smaller than usual and of course without countersunk-hole (even that you could use countersunk screws if you like).